Magnetic alloy



Patented Feb. 25, 1930 UNITED STATES PATENT OFFICE WILLOUGHBY STATHAMSMITH, OF NEWTON POPPLEFORD, AND HENRY JOSEPH GARNETT, OF SEVENOAKS,ENGLAND MAGNETIC ALLOY No Drawing.

This application is a division of-application, Ser. No, 189,735, filedMay 7 1927.

In the Patent No. 1,552,769, granted Sept. 8, 1925, a number of alloyswith high pen meability with very weak magnetizing forces weredescribed; amongst others, alloys composed as follows@:

No. 1 No.2

Nickel 70.5% 65 Iron 18.5% 17 Copper v 10.5% 17 Manganese 0.5% 0.5%

The first alloy had a magnetic permeability of 5300, and the secondalmagnetic permeability of 3200 in magnetic fields tending to zero.

' According to this invention an alloy is composed of Nickel 697l% Iron1415% 7 Copper -t 1416% Nickel 70 Iron 15% Copper 15% with a trace ofmanganese, has given the follo lowing resultswhen drawn to fine wire,an-

nealed and tested The alloy has properties, therefore, which make it, ina tape or wire form, very useful for the manufacture of loadedtelegraphic and telephonic cables.

To the alloy may be-added manganese in 0riginal applieation filed Kay 7,1927, Serial No. 189,735, and in Great Britain July 27, 1926. Dividedand this application filed July 17, 1828. Serial No. 293,484.

quantities of less than .5% as a deoxidizer, but should not contain anytrace of carbon.

What We claim is 1. The combination with an electrical conductor ofloading material applied to said conductor and comprising iron from 14to 15%, copper from 14 to 16%, and the remainder nickel, the initialpermeability of said material being of the order of 6,000.

2. The combination with an electrical conductor of loading materialapplied to said conductor and comprising iron from 14 to 15%, copperfrom 14 to 16%, and the remainder nickel, said material having had aninitial permeability of the order of 6,000 developed by heating to atemperature in excess of the magnetic change point and then cooling.

3. The combination with an electrical conductor of loading materialapplied to said conductor and comprising iron from 14 to 15%, copperfrom 14 to 16%, a deoxidizing metal to an amount not greater than 0.5%,and the remainder nickel, the initial permeability of said materialbeing of the order of 6,000.

4. The combination with an electrical conductor of loading materialapplied to said conductor and comprising iron from 14 to 15%, copperfrom 14 to 16%, a deoxidizing metal to an amount not greater than 0.5%.and the remainder nickel, said material hav ing had an initialpermeability of the order of 6,000 developed by heating to a temperaturein excess of the magnetic change point and then cooling.

In testimony that We claim the foregoing as our invention we have signedournames this twenty-ninth day of June, 1928.

WILLOUGHBY STATHAM SMITH.

HENRY JOSEPH GARNETT.

